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-rw-r--r--src/replay_buffer/replay_buffer.c91
-rw-r--r--src/replay_buffer/replay_buffer_disk.c429
-rw-r--r--src/replay_buffer/replay_buffer_ram.c256
3 files changed, 776 insertions, 0 deletions
diff --git a/src/replay_buffer/replay_buffer.c b/src/replay_buffer/replay_buffer.c
new file mode 100644
index 0000000..92aa645
--- /dev/null
+++ b/src/replay_buffer/replay_buffer.c
@@ -0,0 +1,91 @@
+#include "../../include/replay_buffer/replay_buffer.h"
+#include "../../include/replay_buffer/replay_buffer_ram.h"
+#include "../../include/replay_buffer/replay_buffer_disk.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+gsr_replay_buffer* gsr_replay_buffer_create(gsr_replay_storage replay_storage, const char *replay_directory, double replay_buffer_time, size_t replay_buffer_num_packets) {
+ gsr_replay_buffer *replay_buffer = NULL;
+ switch(replay_storage) {
+ case GSR_REPLAY_STORAGE_RAM:
+ replay_buffer = gsr_replay_buffer_ram_create(replay_buffer_num_packets);
+ break;
+ case GSR_REPLAY_STORAGE_DISK:
+ replay_buffer = gsr_replay_buffer_disk_create(replay_directory, replay_buffer_time);
+ break;
+ }
+
+ replay_buffer->mutex_initialized = false;
+ replay_buffer->original_replay_buffer = NULL;
+ if(pthread_mutex_init(&replay_buffer->mutex, NULL) != 0) {
+ gsr_replay_buffer_destroy(replay_buffer);
+ return NULL;
+ }
+
+ replay_buffer->mutex_initialized = true;
+ return replay_buffer;
+}
+
+void gsr_replay_buffer_destroy(gsr_replay_buffer *self) {
+ self->destroy(self);
+ if(self->mutex_initialized && !self->original_replay_buffer) {
+ pthread_mutex_destroy(&self->mutex);
+ self->mutex_initialized = false;
+ }
+ self->original_replay_buffer = NULL;
+ free(self);
+}
+
+void gsr_replay_buffer_lock(gsr_replay_buffer *self) {
+ if(self->original_replay_buffer) {
+ gsr_replay_buffer_lock(self->original_replay_buffer);
+ return;
+ }
+
+ if(self->mutex_initialized)
+ pthread_mutex_lock(&self->mutex);
+}
+
+void gsr_replay_buffer_unlock(gsr_replay_buffer *self) {
+ if(self->original_replay_buffer) {
+ gsr_replay_buffer_unlock(self->original_replay_buffer);
+ return;
+ }
+
+ if(self->mutex_initialized)
+ pthread_mutex_unlock(&self->mutex);
+}
+
+bool gsr_replay_buffer_append(gsr_replay_buffer *self, const AVPacket *av_packet, double timestamp) {
+ return self->append(self, av_packet, timestamp);
+}
+
+void gsr_replay_buffer_clear(gsr_replay_buffer *self) {
+ self->clear(self);
+}
+
+AVPacket* gsr_replay_buffer_iterator_get_packet(gsr_replay_buffer *self, gsr_replay_buffer_iterator iterator) {
+ return self->iterator_get_packet(self, iterator);
+}
+
+uint8_t* gsr_replay_buffer_iterator_get_packet_data(gsr_replay_buffer *self, gsr_replay_buffer_iterator iterator) {
+ return self->iterator_get_packet_data(self, iterator);
+}
+
+gsr_replay_buffer* gsr_replay_buffer_clone(gsr_replay_buffer *self) {
+ return self->clone(self);
+}
+
+gsr_replay_buffer_iterator gsr_replay_buffer_find_packet_index_by_time_passed(gsr_replay_buffer *self, int seconds) {
+ return self->find_packet_index_by_time_passed(self, seconds);
+}
+
+gsr_replay_buffer_iterator gsr_replay_buffer_find_keyframe(gsr_replay_buffer *self, gsr_replay_buffer_iterator start_iterator, int stream_index, bool invert_stream_index) {
+ return self->find_keyframe(self, start_iterator, stream_index, invert_stream_index);
+}
+
+bool gsr_replay_buffer_iterator_next(gsr_replay_buffer *self, gsr_replay_buffer_iterator *iterator) {
+ return self->iterator_next(self, iterator);
+}
diff --git a/src/replay_buffer/replay_buffer_disk.c b/src/replay_buffer/replay_buffer_disk.c
new file mode 100644
index 0000000..0716f3b
--- /dev/null
+++ b/src/replay_buffer/replay_buffer_disk.c
@@ -0,0 +1,429 @@
+#include "../../include/replay_buffer/replay_buffer_disk.h"
+#include "../../include/utils.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+#include <assert.h>
+
+#define REPLAY_BUFFER_FILE_SIZE_BYTES 1024 * 1024 * 256 /* 256MB */
+#define FILE_PREFIX "Replay"
+
+static void gsr_replay_buffer_disk_set_impl_funcs(gsr_replay_buffer_disk *self);
+
+static void gsr_av_packet_disk_init(gsr_av_packet_disk *self, const AVPacket *av_packet, size_t data_index, double timestamp) {
+ self->packet = *av_packet;
+ self->packet.data = NULL;
+ self->data_index = data_index;
+ self->timestamp = timestamp;
+}
+
+static gsr_replay_buffer_file* gsr_replay_buffer_file_create(char *replay_directory, size_t replay_storage_counter, double timestamp, int *replay_storage_fd) {
+ gsr_replay_buffer_file *self = calloc(1, sizeof(gsr_replay_buffer_file));
+ if(!self) {
+ fprintf(stderr, "gsr error: gsr_av_packet_file_init: failed to create buffer file\n");
+ return NULL;
+ }
+
+ if(create_directory_recursive(replay_directory) != 0) {
+ fprintf(stderr, "gsr error: gsr_av_packet_file_init: failed to create replay directory: %s\n", replay_directory);
+ free(self);
+ return NULL;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s/%s_%d.mp4", replay_directory, FILE_PREFIX, (int)replay_storage_counter);
+ *replay_storage_fd = creat(filename, 0700);
+ if(*replay_storage_fd <= 0) {
+ fprintf(stderr, "gsr error: gsr_av_packet_file_init: failed to create replay file: %s\n", filename);
+ free(self);
+ return NULL;
+ }
+
+ self->id = replay_storage_counter;
+ self->start_timestamp = timestamp;
+ self->end_timestamp = timestamp;
+ self->ref_counter = 1;
+ self->fd = -1;
+
+ self->packets = NULL;
+ self->capacity_num_packets = 0;
+ self->num_packets = 0;
+ return self;
+}
+
+static gsr_replay_buffer_file* gsr_replay_buffer_file_ref(gsr_replay_buffer_file *self) {
+ if(self->ref_counter >= 1)
+ ++self->ref_counter;
+ return self;
+}
+
+static void gsr_replay_buffer_file_free(gsr_replay_buffer_file *self, const char *replay_directory) {
+ self->ref_counter = 0;
+
+ if(self->fd > 0) {
+ close(self->fd);
+ self->fd = -1;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s/%s_%d.mp4", replay_directory, FILE_PREFIX, (int)self->id);
+ remove(filename);
+
+ if(self->packets) {
+ free(self->packets);
+ self->packets = NULL;
+ }
+ self->num_packets = 0;
+ self->capacity_num_packets = 0;
+
+ free(self);
+}
+
+static void gsr_replay_buffer_file_unref(gsr_replay_buffer_file *self, const char *replay_directory) {
+ if(self->ref_counter > 0)
+ --self->ref_counter;
+
+ if(self->ref_counter <= 0)
+ gsr_replay_buffer_file_free(self, replay_directory);
+}
+
+static void gsr_replay_buffer_disk_clear(gsr_replay_buffer *replay_buffer) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+ for(size_t i = 0; i < self->num_files; ++i) {
+ gsr_replay_buffer_file_unref(self->files[i], self->replay_directory);
+ }
+ self->num_files = 0;
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+
+ if(self->storage_fd > 0) {
+ close(self->storage_fd);
+ self->storage_fd = 0;
+ }
+
+ self->storage_counter = 0;
+ self->storage_num_bytes_written = 0;
+}
+
+static void gsr_replay_buffer_disk_destroy(gsr_replay_buffer *replay_buffer) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ gsr_replay_buffer_disk_clear(replay_buffer);
+
+ if(self->owns_directory) {
+ remove(self->replay_directory);
+ self->owns_directory = false;
+ }
+}
+
+static bool file_write_all(int fd, const uint8_t *data, size_t size, size_t *bytes_written_total) {
+ *bytes_written_total = 0;
+ while(*bytes_written_total < size) {
+ const ssize_t bytes_written = write(fd, data + *bytes_written_total, size - *bytes_written_total);
+ if(bytes_written == -1) {
+ if(errno == EAGAIN)
+ continue;
+ else
+ return false;
+ }
+ *bytes_written_total += bytes_written;
+ }
+ return true;
+}
+
+static bool gsr_replay_buffer_disk_create_next_file(gsr_replay_buffer_disk *self, double timestamp) {
+ if(self->num_files + 1 >= GSR_REPLAY_BUFFER_CAPACITY_NUM_FILES) {
+ fprintf(stderr, "gsr error: gsr_replay_buffer_disk_create_next_file: too many replay buffer files created! (> %d), either reduce the replay buffer time or report this as a bug\n", (int)GSR_REPLAY_BUFFER_CAPACITY_NUM_FILES);
+ return false;
+ }
+
+ gsr_replay_buffer_file *replay_buffer_file = gsr_replay_buffer_file_create(self->replay_directory, self->storage_counter, timestamp, &self->storage_fd);
+ if(!replay_buffer_file)
+ return false;
+
+ self->files[self->num_files] = replay_buffer_file;
+ ++self->num_files;
+ ++self->storage_counter;
+ return true;
+}
+
+static bool gsr_replay_buffer_disk_append_to_current_file(gsr_replay_buffer_disk *self, const AVPacket *av_packet, double timestamp) {
+ gsr_replay_buffer_file *replay_buffer_file = self->files[self->num_files - 1];
+ replay_buffer_file->end_timestamp = timestamp;
+
+ if(replay_buffer_file->num_packets + 1 >= replay_buffer_file->capacity_num_packets) {
+ size_t new_capacity_num_packets = replay_buffer_file->capacity_num_packets * 2;
+ if(new_capacity_num_packets == 0)
+ new_capacity_num_packets = 256;
+
+ void *new_packets = realloc(replay_buffer_file->packets, new_capacity_num_packets * sizeof(gsr_av_packet_disk));
+ if(!new_packets) {
+ fprintf(stderr, "gsr error: gsr_replay_buffer_disk_append_to_current_file: failed to reallocate replay buffer file packets\n");
+ return false;
+ }
+
+ replay_buffer_file->capacity_num_packets = new_capacity_num_packets;
+ replay_buffer_file->packets = new_packets;
+ }
+
+ gsr_av_packet_disk *packet = &replay_buffer_file->packets[replay_buffer_file->num_packets];
+ gsr_av_packet_disk_init(packet, av_packet, self->storage_num_bytes_written, timestamp);
+ ++replay_buffer_file->num_packets;
+
+ size_t bytes_written = 0;
+ const bool file_written = file_write_all(self->storage_fd, av_packet->data, av_packet->size, &bytes_written);
+ self->storage_num_bytes_written += bytes_written;
+ if(self->storage_num_bytes_written >= REPLAY_BUFFER_FILE_SIZE_BYTES) {
+ self->storage_num_bytes_written = 0;
+ close(self->storage_fd);
+ self->storage_fd = 0;
+ }
+
+ return file_written;
+}
+
+static void gsr_replay_buffer_disk_remove_first_file(gsr_replay_buffer_disk *self) {
+ gsr_replay_buffer_file_unref(self->files[0], self->replay_directory);
+ for(size_t i = 1; i < self->num_files; ++i) {
+ self->files[i - 1] = self->files[i];
+ }
+ --self->num_files;
+}
+
+static bool gsr_replay_buffer_disk_append(gsr_replay_buffer *replay_buffer, const AVPacket *av_packet, double timestamp) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ bool success = false;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+
+ if(self->storage_fd <= 0) {
+ if(!gsr_replay_buffer_disk_create_next_file(self, timestamp))
+ goto done;
+ }
+
+ const bool data_written = gsr_replay_buffer_disk_append_to_current_file(self, av_packet, timestamp);
+
+ if(self->num_files > 1) {
+ const double buffer_time_accumulated = timestamp - self->files[1]->start_timestamp;
+ if(buffer_time_accumulated >= self->replay_buffer_time)
+ gsr_replay_buffer_disk_remove_first_file(self);
+ }
+
+ success = data_written;
+
+ done:
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return success;
+}
+
+static AVPacket* gsr_replay_buffer_disk_iterator_get_packet(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator iterator) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ assert(iterator.file_index < self->num_files);
+ assert(iterator.packet_index < self->files[iterator.file_index]->num_packets);
+ return &self->files[iterator.file_index]->packets[iterator.packet_index].packet;
+}
+
+static uint8_t* gsr_replay_buffer_disk_iterator_get_packet_data(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator iterator) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ assert(iterator.file_index < self->num_files);
+ gsr_replay_buffer_file *file = self->files[iterator.file_index];
+ assert(iterator.packet_index < file->num_packets);
+
+ if(file->fd <= 0) {
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s/%s_%d.mp4", self->replay_directory, FILE_PREFIX, (int)file->id);
+ file->fd = open(filename, O_RDONLY);
+ if(file->fd <= 0)
+ return NULL;
+ }
+
+ const gsr_av_packet_disk *packet = &self->files[iterator.file_index]->packets[iterator.packet_index];
+ if(lseek(file->fd, packet->data_index, SEEK_SET) == -1)
+ return NULL;
+
+ uint8_t *packet_data = malloc(packet->packet.size);
+ if(read(file->fd, packet_data, packet->packet.size) != packet->packet.size) {
+ free(packet_data);
+ return NULL;
+ }
+
+ return packet_data;
+}
+
+static gsr_replay_buffer* gsr_replay_buffer_disk_clone(gsr_replay_buffer *replay_buffer) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ gsr_replay_buffer_disk *destination = calloc(1, sizeof(gsr_replay_buffer_disk));
+ if(!destination)
+ return NULL;
+
+ gsr_replay_buffer_disk_set_impl_funcs(destination);
+ gsr_replay_buffer_lock(&self->replay_buffer);
+
+ destination->replay_buffer.original_replay_buffer = replay_buffer;
+ destination->replay_buffer.mutex = self->replay_buffer.mutex;
+ destination->replay_buffer.mutex_initialized = self->replay_buffer.mutex_initialized;
+ destination->replay_buffer_time = self->replay_buffer_time;
+ destination->storage_counter = self->storage_counter;
+ destination->storage_num_bytes_written = self->storage_num_bytes_written;
+ destination->storage_fd = 0; // We only want to read from the clone. If there is a need to write to it in the future then TODO change this
+
+ for(size_t i = 0; i < self->num_files; ++i) {
+ destination->files[i] = gsr_replay_buffer_file_ref(self->files[i]);
+ }
+ destination->num_files = self->num_files;
+
+ snprintf(destination->replay_directory, sizeof(destination->replay_directory), "%s", self->replay_directory);
+ destination->owns_directory = false;
+
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer*)destination;
+}
+
+/* Binary search */
+static size_t gsr_replay_buffer_file_find_packet_index_by_time_passed(const gsr_replay_buffer_file *self, int seconds) {
+ const double now = clock_get_monotonic_seconds();
+ if(self->num_packets == 0) {
+ return 0;
+ }
+
+ size_t lower_bound = 0;
+ size_t upper_bound = self->num_packets;
+ size_t index = 0;
+
+ for(;;) {
+ index = lower_bound + (upper_bound - lower_bound) / 2;
+ const gsr_av_packet_disk *packet = &self->packets[index];
+ const double time_passed_since_packet = now - packet->timestamp;
+ if(time_passed_since_packet >= seconds) {
+ if(lower_bound == index)
+ break;
+ lower_bound = index;
+ } else {
+ if(upper_bound == index)
+ break;
+ upper_bound = index;
+ }
+ }
+
+ return index;
+}
+
+/* Binary search */
+static gsr_replay_buffer_iterator gsr_replay_buffer_disk_find_file_index_by_time_passed(gsr_replay_buffer *replay_buffer, int seconds) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+
+ const double now = clock_get_monotonic_seconds();
+ if(self->num_files == 0) {
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer_iterator){0, 0};
+ }
+
+ size_t lower_bound = 0;
+ size_t upper_bound = self->num_files;
+ size_t file_index = 0;
+
+ for(;;) {
+ file_index = lower_bound + (upper_bound - lower_bound) / 2;
+ const gsr_replay_buffer_file *file = self->files[file_index];
+ const double time_passed_since_file_start = now - file->start_timestamp;
+ const double time_passed_since_file_end = now - file->end_timestamp;
+ if(time_passed_since_file_start >= seconds && time_passed_since_file_end <= seconds) {
+ break;
+ } else if(time_passed_since_file_start >= seconds) {
+ if(lower_bound == file_index)
+ break;
+ lower_bound = file_index;
+ } else {
+ if(upper_bound == file_index)
+ break;
+ upper_bound = file_index;
+ }
+ }
+
+ const gsr_replay_buffer_file *file = self->files[file_index];
+ const size_t packet_index = gsr_replay_buffer_file_find_packet_index_by_time_passed(file, seconds);
+
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer_iterator){packet_index, file_index};
+}
+
+static gsr_replay_buffer_iterator gsr_replay_buffer_disk_find_keyframe(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator start_iterator, int stream_index, bool invert_stream_index) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ gsr_replay_buffer_iterator keyframe_iterator = {(size_t)-1, 0};
+ gsr_replay_buffer_lock(&self->replay_buffer);
+ for(size_t file_index = start_iterator.file_index; file_index < self->num_files; ++file_index) {
+ const gsr_replay_buffer_file *file = self->files[file_index];
+ for(size_t packet_index = start_iterator.packet_index; packet_index < file->num_packets; ++packet_index) {
+ const gsr_av_packet_disk *packet = &file->packets[packet_index];
+ if((packet->packet.flags & AV_PKT_FLAG_KEY) && (invert_stream_index ? packet->packet.stream_index != stream_index : packet->packet.stream_index == stream_index)) {
+ keyframe_iterator.packet_index = packet_index;
+ keyframe_iterator.file_index = file_index;
+ break;
+ }
+ }
+ }
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return keyframe_iterator;
+}
+
+static bool gsr_replay_buffer_disk_iterator_next(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator *iterator) {
+ gsr_replay_buffer_disk *self = (gsr_replay_buffer_disk*)replay_buffer;
+ if(iterator->file_index >= self->num_files)
+ return false;
+
+ if(iterator->packet_index + 1 >= self->files[iterator->file_index]->num_packets) {
+ if(iterator->file_index + 1 >= self->num_files)
+ return false;
+
+ if(self->files[iterator->file_index + 1]->num_packets == 0)
+ return false;
+
+ ++iterator->file_index;
+ iterator->packet_index = 0;
+ return true;
+ } else {
+ ++iterator->packet_index;
+ return true;
+ }
+}
+
+static void get_current_time(char *time_str, size_t time_str_size) {
+ time_t now = time(NULL);
+ struct tm *t = localtime(&now);
+ strftime(time_str, time_str_size - 1, "%Y-%m-%d_%H-%M-%S", t);
+}
+
+static void gsr_replay_buffer_disk_set_impl_funcs(gsr_replay_buffer_disk *self) {
+ self->replay_buffer.destroy = gsr_replay_buffer_disk_destroy;
+ self->replay_buffer.append = gsr_replay_buffer_disk_append;
+ self->replay_buffer.clear = gsr_replay_buffer_disk_clear;
+ self->replay_buffer.iterator_get_packet = gsr_replay_buffer_disk_iterator_get_packet;
+ self->replay_buffer.iterator_get_packet_data = gsr_replay_buffer_disk_iterator_get_packet_data;
+ self->replay_buffer.clone = gsr_replay_buffer_disk_clone;
+ self->replay_buffer.find_packet_index_by_time_passed = gsr_replay_buffer_disk_find_file_index_by_time_passed;
+ self->replay_buffer.find_keyframe = gsr_replay_buffer_disk_find_keyframe;
+ self->replay_buffer.iterator_next = gsr_replay_buffer_disk_iterator_next;
+}
+
+gsr_replay_buffer* gsr_replay_buffer_disk_create(const char *replay_directory, double replay_buffer_time) {
+ assert(replay_buffer_time > 0);
+ gsr_replay_buffer_disk *replay_buffer = calloc(1, sizeof(gsr_replay_buffer_disk));
+ if(!replay_buffer)
+ return NULL;
+
+ char time_str[128];
+ get_current_time(time_str, sizeof(time_str));
+
+ replay_buffer->num_files = 0;
+ replay_buffer->storage_counter = 0;
+ replay_buffer->replay_buffer_time = replay_buffer_time;
+ snprintf(replay_buffer->replay_directory, sizeof(replay_buffer->replay_directory), "%s/gsr-replay-%s.gsr", replay_directory, time_str);
+ replay_buffer->owns_directory = true;
+
+ gsr_replay_buffer_disk_set_impl_funcs(replay_buffer);
+ return (gsr_replay_buffer*)replay_buffer;
+}
diff --git a/src/replay_buffer/replay_buffer_ram.c b/src/replay_buffer/replay_buffer_ram.c
new file mode 100644
index 0000000..890588f
--- /dev/null
+++ b/src/replay_buffer/replay_buffer_ram.c
@@ -0,0 +1,256 @@
+#include "../../include/replay_buffer/replay_buffer_ram.h"
+#include "../../include/utils.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <libavutil/mem.h>
+
+static void gsr_replay_buffer_ram_set_impl_funcs(gsr_replay_buffer_ram *self);
+
+static gsr_av_packet_ram* gsr_av_packet_ram_create(const AVPacket *av_packet, double timestamp) {
+ gsr_av_packet_ram *self = malloc(sizeof(gsr_av_packet_ram));
+ if(!self)
+ return NULL;
+
+ self->ref_counter = 1;
+ self->packet = *av_packet;
+ self->timestamp = timestamp;
+ // Why are we doing this you ask? there is a ffmpeg bug that causes cpu usage to increase over time when you have
+ // packets that are not being free'd until later. So we copy the packet data, free the packet and then reconstruct
+ // the packet later on when we need it, to keep packets alive only for a short period.
+ self->packet.data = av_memdup(av_packet->data, av_packet->size);
+ if(!self->packet.data) {
+ free(self);
+ return NULL;
+ }
+
+ return self;
+}
+
+static gsr_av_packet_ram* gsr_av_packet_ram_ref(gsr_av_packet_ram *self) {
+ if(self->ref_counter >= 1)
+ ++self->ref_counter;
+ return self;
+}
+
+static void gsr_av_packet_ram_free(gsr_av_packet_ram *self) {
+ self->ref_counter = 0;
+ if(self->packet.data) {
+ av_free(self->packet.data);
+ self->packet.data = NULL;
+ }
+ free(self);
+}
+
+static void gsr_av_packet_ram_unref(gsr_av_packet_ram *self) {
+ if(self->ref_counter >= 1)
+ --self->ref_counter;
+
+ if(self->ref_counter <= 0)
+ gsr_av_packet_ram_free(self);
+}
+
+static void gsr_replay_buffer_ram_destroy(gsr_replay_buffer *replay_buffer) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+ for(size_t i = 0; i < self->num_packets; ++i) {
+ if(self->packets[i]) {
+ gsr_av_packet_ram_unref(self->packets[i]);
+ self->packets[i] = NULL;
+ }
+ }
+ self->num_packets = 0;
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+
+ if(self->packets) {
+ free(self->packets);
+ self->packets = NULL;
+ }
+
+ self->capacity_num_packets = 0;
+ self->index = 0;
+}
+
+static bool gsr_replay_buffer_ram_append(gsr_replay_buffer *replay_buffer, const AVPacket *av_packet, double timestamp) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+ gsr_av_packet_ram *packet = gsr_av_packet_ram_create(av_packet, timestamp);
+ if(!packet) {
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return false;
+ }
+
+ if(self->packets[self->index]) {
+ gsr_av_packet_ram_unref(self->packets[self->index]);
+ self->packets[self->index] = NULL;
+ }
+ self->packets[self->index] = packet;
+
+ self->index = (self->index + 1) % self->capacity_num_packets;
+ ++self->num_packets;
+ if(self->num_packets > self->capacity_num_packets)
+ self->num_packets = self->capacity_num_packets;
+
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return true;
+}
+
+static void gsr_replay_buffer_ram_clear(gsr_replay_buffer *replay_buffer) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+ for(size_t i = 0; i < self->num_packets; ++i) {
+ if(self->packets[i]) {
+ gsr_av_packet_ram_unref(self->packets[i]);
+ self->packets[i] = NULL;
+ }
+ }
+ self->num_packets = 0;
+ self->index = 0;
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+}
+
+static gsr_av_packet_ram* gsr_replay_buffer_ram_get_packet_at_index(gsr_replay_buffer *replay_buffer, size_t index) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ assert(index < self->num_packets);
+ size_t start_index = 0;
+ if(self->num_packets < self->capacity_num_packets)
+ start_index = self->num_packets - self->index;
+ else
+ start_index = self->index;
+
+ const size_t offset = (start_index + index) % self->capacity_num_packets;
+ return self->packets[offset];
+}
+
+static AVPacket* gsr_replay_buffer_ram_iterator_get_packet(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator iterator) {
+ return &gsr_replay_buffer_ram_get_packet_at_index(replay_buffer, iterator.packet_index)->packet;
+}
+
+static uint8_t* gsr_replay_buffer_ram_iterator_get_packet_data(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator iterator) {
+ (void)replay_buffer;
+ (void)iterator;
+ return NULL;
+}
+
+static gsr_replay_buffer* gsr_replay_buffer_ram_clone(gsr_replay_buffer *replay_buffer) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ gsr_replay_buffer_ram *destination = calloc(1, sizeof(gsr_replay_buffer_ram));
+ if(!destination)
+ return NULL;
+
+ gsr_replay_buffer_ram_set_impl_funcs(destination);
+ gsr_replay_buffer_lock(&self->replay_buffer);
+
+ destination->replay_buffer.original_replay_buffer = replay_buffer;
+ destination->replay_buffer.mutex = self->replay_buffer.mutex;
+ destination->replay_buffer.mutex_initialized = self->replay_buffer.mutex_initialized;
+ destination->capacity_num_packets = self->capacity_num_packets;
+ destination->index = self->index;
+ destination->packets = calloc(destination->capacity_num_packets, sizeof(gsr_av_packet_ram*));
+ if(!destination->packets) {
+ free(destination);
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return NULL;
+ }
+
+ destination->num_packets = self->num_packets;
+ for(size_t i = 0; i < destination->num_packets; ++i) {
+ destination->packets[i] = gsr_av_packet_ram_ref(self->packets[i]);
+ }
+
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer*)destination;
+}
+
+/* Binary search */
+static gsr_replay_buffer_iterator gsr_replay_buffer_ram_find_packet_index_by_time_passed(gsr_replay_buffer *replay_buffer, int seconds) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+
+ const double now = clock_get_monotonic_seconds();
+ if(self->num_packets == 0) {
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer_iterator){0, 0};
+ }
+
+ size_t lower_bound = 0;
+ size_t upper_bound = self->num_packets;
+ size_t index = 0;
+
+ for(;;) {
+ index = lower_bound + (upper_bound - lower_bound) / 2;
+ const gsr_av_packet_ram *packet = gsr_replay_buffer_ram_get_packet_at_index(replay_buffer, index);
+ const double time_passed_since_packet = now - packet->timestamp;
+ if(time_passed_since_packet >= seconds) {
+ if(lower_bound == index)
+ break;
+ lower_bound = index;
+ } else {
+ if(upper_bound == index)
+ break;
+ upper_bound = index;
+ }
+ }
+
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer_iterator){index, 0};
+}
+
+static gsr_replay_buffer_iterator gsr_replay_buffer_ram_find_keyframe(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator start_iterator, int stream_index, bool invert_stream_index) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ size_t keyframe_index = (size_t)-1;
+ gsr_replay_buffer_lock(&self->replay_buffer);
+ for(size_t i = start_iterator.packet_index; i < self->num_packets; ++i) {
+ const gsr_av_packet_ram *packet = gsr_replay_buffer_ram_get_packet_at_index(replay_buffer, i);
+ if((packet->packet.flags & AV_PKT_FLAG_KEY) && (invert_stream_index ? packet->packet.stream_index != stream_index : packet->packet.stream_index == stream_index)) {
+ keyframe_index = i;
+ break;
+ }
+ }
+ gsr_replay_buffer_unlock(&self->replay_buffer);
+ return (gsr_replay_buffer_iterator){keyframe_index, 0};
+}
+
+static bool gsr_replay_buffer_ram_iterator_next(gsr_replay_buffer *replay_buffer, gsr_replay_buffer_iterator *iterator) {
+ gsr_replay_buffer_ram *self = (gsr_replay_buffer_ram*)replay_buffer;
+ if(iterator->packet_index + 1 < self->num_packets) {
+ ++iterator->packet_index;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static void gsr_replay_buffer_ram_set_impl_funcs(gsr_replay_buffer_ram *self) {
+ self->replay_buffer.destroy = gsr_replay_buffer_ram_destroy;
+ self->replay_buffer.append = gsr_replay_buffer_ram_append;
+ self->replay_buffer.clear = gsr_replay_buffer_ram_clear;
+ self->replay_buffer.iterator_get_packet = gsr_replay_buffer_ram_iterator_get_packet;
+ self->replay_buffer.iterator_get_packet_data = gsr_replay_buffer_ram_iterator_get_packet_data;
+ self->replay_buffer.clone = gsr_replay_buffer_ram_clone;
+ self->replay_buffer.find_packet_index_by_time_passed = gsr_replay_buffer_ram_find_packet_index_by_time_passed;
+ self->replay_buffer.find_keyframe = gsr_replay_buffer_ram_find_keyframe;
+ self->replay_buffer.iterator_next = gsr_replay_buffer_ram_iterator_next;
+}
+
+gsr_replay_buffer* gsr_replay_buffer_ram_create(size_t replay_buffer_num_packets) {
+ assert(replay_buffer_num_packets > 0);
+ gsr_replay_buffer_ram *replay_buffer = calloc(1, sizeof(gsr_replay_buffer_ram));
+ if(!replay_buffer)
+ return NULL;
+
+ replay_buffer->capacity_num_packets = replay_buffer_num_packets;
+ replay_buffer->num_packets = 0;
+ replay_buffer->index = 0;
+ replay_buffer->packets = calloc(replay_buffer->capacity_num_packets, sizeof(gsr_av_packet_ram*));
+ if(!replay_buffer->packets) {
+ gsr_replay_buffer_ram_destroy(&replay_buffer->replay_buffer);
+ free(replay_buffer);
+ return NULL;
+ }
+
+ gsr_replay_buffer_ram_set_impl_funcs(replay_buffer);
+ return (gsr_replay_buffer*)replay_buffer;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-05-06 16:04:25 +0000